Tellurocysteine

Tellurocysteine
Names
	IUPAC name (2R)-2-Amino-3-tellanylpropanoic acid
	Other names Tellurocystine
Identifiers
3D model (JSmol)	Interactive image;
ChemSpider	34500822;
PubChem CID	129631934;
	InChI InChI=1S/C3H7NO2Te/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6) Key: PRMLZSRTFWAUAH-UHFFFAOYSA-N;
	SMILES C([C@@H](C(=O)O)N)[Te];
Properties
Chemical formula	C3H7NO2Te
Molar mass	216.69 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tellurocysteine (in some publications referred to as Te-Cys) is an amino acid with the formula HTeCH₂CH(NH₂)CO₂H. It would be the heavy analogue of serine, cysteine, and selenocysteine. Tellurol (RTeH) is a rare and fragile functional group, especially alkyl derivatives. Furthermore the C-Te bond (200 kJ/mol) is weak compared to 234 kJ/mol for the C-Se bond.^[1] These factors combine to make tellurocysteine very labile. Even selenocysteine occurs only rarely in nature.^[2] Instead of tellurocysteine, tellurocystine is generally isolated instead. It has the formula (TeCH₂CH(NH₂)CO₂H)₂, with a central Te-Te bond.^[3]

^ Chivers, Tristram; Laitinen, Risto S. (23 March 2015). "Tellurium: a maverick among the chalcogens". Chemical Society Reviews. 44 (7): 1725–1739. doi:10.1039/C4CS00434E. ISSN 1460-4744. PMID 25692398.
^ Advances in Microbial Physiology. Academic Press. 2007. p. 4. ISBN 9780080560649.
^ Cite error: The named reference Stocking was invoked but never defined (see the help page).

[1] Chivers, Tristram; Laitinen, Risto S. (23 March 2015). "Tellurium: a maverick among the chalcogens". Chemical Society Reviews. 44 (7): 1725–1739. doi:10.1039/C4CS00434E. ISSN 1460-4744. PMID 25692398.

[2] Advances in Microbial Physiology. Academic Press. 2007. p. 4. ISBN 9780080560649.

[Stocking-3] Cite error: The named reference Stocking was invoked but never defined (see the help page).

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